199223831 has 2 divisors, whose sum is σ = 199223832. Its totient is φ = 199223830.

The previous prime is 199223803. The next prime is 199223851. The reversal of 199223831 is 138322991.

It is a strong prime.

It is an emirp because it is prime and its reverse (138322991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-199223831 is a prime.

It is a super-2 number, since 2×199223831² = 79380269676633122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199223851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99611915 + 99611916.

It is an arithmetic number, because the mean of its divisors is an integer number (99611916).

Almost surely, 2^199223831 is an apocalyptic number.

199223831 is a deficient number, since it is larger than the sum of its proper divisors (1).

199223831 is an equidigital number, since it uses as much as digits as its factorization.

199223831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 38.

The square root of 199223831 is about 14114.6672295170. The cubic root of 199223831 is about 584.0460562523.

The spelling of 199223831 in words is "one hundred ninety-nine million, two hundred twenty-three thousand, eight hundred thirty-one".